Join performance - Database Discussion Boards

uglyeyes2-Aug-09 14:57

2-Aug-09 14:57

Hi! I need to do below note sure how can i design database as web application performance is a key to this

development scenario:

1. organisation adds up available fields (label and input field) that comes from synonym table
2. ability to add extra fields(label and input field)

synonym table as i think might have below cols not sure..

SID, SNAME, ORGID, ORGWGID, datatype
--------------------------------------
1, firstname, null, null, string - generic
2, lastname, null, null,string - generic
3, initialname, 1,1,string - orgid 1 specific
4, givenname,1,1,string
5,fname,2,2,string
6,surname,2,2,string

1. change synonym for existing default fields that will appear in the webform
2. add additional fields as per need for individual organisation (orgid=organisationId, orgwgid=organisation workgroup id)

please comment if my requirement is not clear. I am confused how should i design table as user might want to add extra form field i.e a label and textbox/checkbox/listbox/combo/moneyfield..all 27 datatypes available in sql. now I dont know how to do this as there will be about 20 organisation that might use this web application. thanks in advance.

Re: designing database tables to store data

Henry Minute3-Aug-09 2:09

Henry Minute

3-Aug-09 2:09

I have a cunning plan!

Use two (or possibly more) tables, I haven't completely thought this out. Smile | :)

First table for Generic data.

Second table:

OrganizationID
NameForAdditionalField
TypeForAdditionalField
Length...
etc

I hope that you get the idea. One table contains the 'required' fields and the other table(s) allow you to organise the requirements for each client.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Accessing the file of a T-SQL BACKUP call

Uwe Keim2-Aug-09 5:52

Uwe Keim

2-Aug-09 5:52

Trying to provide a backup "button" inside the C# Windows Forms application on a client PC that connects to a SQL Server database, I want to grab the resulting backup file of a call to the BACKUP DATABASE [^] T-SQL function.

Since the BACKUP DATABASE function takes a file path that is relative to the SQL Server itself, I see no reliable way to get the resulting backup file from the client.

My ideal way would be:

1.) Call the BACKUP DATABASE function from my client application.
2.) Specify to backup to a local file (or even better: a C#/.NET stream[^]).
3.) Capture the resulting BAK file from my client application.

Question: Is this possible to achieve?

(I will cross-post this message to the C# forum, since I am unsure whether this is more an ADO.NET topic)

Thanks
Uwe

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Re: Accessing the file of a T-SQL BACKUP call

scottgp2-Aug-09 14:34

scottgp

2-Aug-09 14:34

On the link you included for the BACKUP command documentation, you'll see a section named "Backup History Tables". You can try reading those system tables - it looks like physical_name in the backupfile system table might have what you want.
Scott

Re: Accessing the file of a T-SQL BACKUP call

Uwe Keim2-Aug-09 19:14

Uwe Keim

2-Aug-09 19:14

Thank you, Scott!

I will try to investigate. The idea was to have the user do ZERO configuration, except specifying the connection string. Hopefully I will manage to do.

Cheers
Uwe

Re: Accessing the file of a T-SQL BACKUP call

Vimalsoft(Pty) Ltd3-Aug-09 4:50

Vimalsoft(Pty) Ltd

3-Aug-09 4:50

Good Day Uwe

Someone asked a very same questions weeks ago and i have given an answer. please search anything by me here on CP.

Vuyiswa Maseko,

Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.somee.com
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/

Re: Accessing the file of a T-SQL BACKUP call

Uwe Keim3-Aug-09 6:00

Uwe Keim

3-Aug-09 6:00

Thanks!

If found this one [^] and several others [^].

But seem to have no match Frown | :-(

Anyway, I keep searching for a match Smile | :)

Join performance

Xmen Real 1-Aug-09 15:26

Xmen Real

1-Aug-09 15:26

I'm a bit confuse in following comparision

select * from table1 t1 join table2 t2 on t1.ID=t2.ID where t1.ID>5

select * from (select * from table1 where ID>5) t1 join table2 t2 on t1.ID=t2.ID

the second query make sense that it will be faster as its filtering rows before join but I wanna know that does 'where' executes before 'join' (in first query condition) ?

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%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>

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Re: Join performance

Mycroft Holmes1-Aug-09 23:43

Mycroft Holmes

1-Aug-09 23:43

Try turning on the execution plan and examine the details. I doubt it makes any different at all as SQL interprets the query anyway.

Don't forget you can also have

Select *
From Table1, Table2
where Table1.something = 'value'
 and table1.key = table2.key

I'm pretty sure the execution plan is the same but using the join style makes it more readable and therefore easier to support.

Never underestimate the power of human stupidity
RAH

Re: Join performance

Vimalsoft(Pty) Ltd2-Aug-09 21:46

Vimalsoft(Pty) Ltd

2-Aug-09 21:46

Good Morning Xmen W.K.

1)Select only the Column you want to display

2)The Second Query is a bad Query

3)Do you have indexes on the ID Field ?

Re: Join performance

Xmen Real 3-Aug-09 2:45

Xmen Real

3-Aug-09 2:45

why select only one column if I need all of 'em...I know in that case ID column will appear twice as it will from both tables but its just an example...

and why second is bad ?

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Re: Join performance

Vimalsoft(Pty) Ltd3-Aug-09 3:07

Vimalsoft(Pty) Ltd

3-Aug-09 3:07

Xmen

i was wrong i misjudged your statements. The Queries are the same and the execution plan is the same in all parts.

Re: Join performance

Xmen Real 3-Aug-09 3:21

Xmen Real

3-Aug-09 3:21

no problem Wink | ;)

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SQL query: Get correspondence descriptions instead foreign key IDs. Is that possible ?

sdancer7531-Jul-09 5:00

sdancer75

31-Jul-09 5:00

Hi,

I have 4 tables in a cascading mode like this : 1)Countries --> 2)Chapionships --> 3) Teams --> 4) Coupons

Coupons table has 2 IDs (HomeTeamID and HostTeamID) that points to the Teams table.
It has also IDs for the tables (Countries and Chapionships)

All I want is to select the appropriate records from the Coupons Table, but instead of the foreing keys IDs I want the correspondence descriptions that these keys shows from their tables (ie Countries, Chapionships and Teams).

Is that possible ?

All I did until now is the query

SELECT * FROM Coupons LEFT JOIN (Countries, Chapionships, Teams)<br />
ON (Countries.CountryID=Coupons.CountryID AND Chapionships.ChapionshipID=Coupons.ChapionshipID AND ( Teams.TeamID=Coupons.HomeTeamID OR Teams.TeamID=Coupons.HostTeamID)) Where Date='2009-07-31' order by Time Asc;

but I get double rows for each record since there is an OR clause inside the ON. Any better solution ?

Regards

sdancer75

Re: SQL query: Get correspondence descriptions instead foreign key IDs. Is that possible ?

Blue_Boy31-Jul-09 7:12

Blue_Boy

31-Jul-09 7:12

Use distinct or try to group.

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SQL SP exception: "Incorrect syntax near '-'"

cdietschrun31-Jul-09 4:14

cdietschrun

31-Jul-09 4:14

I am getting an exception thrown from my web app's call to a SQL SP.

The expecption says "incorrect syntax near '-'". The dash I have narrowed down to an argument passed to the stored procedure contains dashes, such as 992-123-123. The SP works fine if the argument passed is 992123123.

What is the best way of fixing this? In all likelyhood it is more important to keep the dashes in the entries in the columns. I think it is just my SP syntax, so here it is: @PACKAGE is the value that is giving issues, which is 999-999-999 style.

CODE

CREATE PROCEDURE dbo.sp_UpdateItemColumn
(
@PACKAGE nvarchar(255),
@COLUMN nvarchar(30),
@VALUE nvarchar(100),
@LASTCHANGEBY nvarchar(100)
)
AS

declare @sql nvarchar(1024)
set @sql=''

set @sql=@sql+'update tbl_swbom_checklist_items set '+@COLUMN+'='''+@VALUE+''' where package='''+@PACKAGE+''' '

--print @sql

exec sp_executesql @sql
GO

Re: SQL SP exception: "Incorrect syntax near '-'"

^That's Aragon1-Aug-09 1:56

^That's Aragon

1-Aug-09 1:56

hi there,

please try to do below query. It is working perfect with the '-' value.

declare @sql nvarchar(1024)
set @sql=''
set @sql=@sql+'update tbl_swbom_checklist_items set ' + @COLUMN + '=' + '''' +@VALUE + ''' where @PACKAGE='''+ @PACKAGE +'''' 
exec (@sql)

Regards

How to Use an Array Variant as a control name?

dpminusa31-Jul-09 2:00

dpminusa

31-Jul-09 2:00

I have a Tab control with 15 tabs. I am using the TabCtl.Value in Select statements to control the ListBoxes, Reports, etc. for each tab. It occurred to me that I could simplify this greatly by defining a Variant Array of the ListBox names and report names. Then I could simply use array(TabCtl.Value) instead of the Select Statement details.

The problem is that I cannot see how to make the array(TabCtl.Value) into a Control name that accepts property or method references. It seems like this should be simple, but I have tried a few things with no success.

I am using Access 2007 on Vista Bus 32. Here is a sample of my code: (I have used the same names for the Queries, ListBoxes, Reports, etc. as a way of maximizing the usefulness of the one array and as an aid to reducing misspellings during coding. I find this less confusing than a lot of similar names.)

'An Array of Query Names to use as the RowSource for A Tab ListBox.
Dim lstFindRptNames As Variant
    
    lstFindRptNames = Array("lstByCusName", _
    "lstByContact1", _
    "lstByContact2", _
    "lstByContact3", _
        ...
    "lstByProspect", _
    "lstByCustomer")


'Populate the ListBox by referencing a Query of the same name as the RowSource
lstFindRptNames(TabCtl0.Value).RowSource = lstFindRptNames(TabCtl0)

This fails because Access does not seem to substitute the String, in context, with the Control of the same name. So I tried to help it out with making a Control with a DIM first, I also tried a Generic Object. Neither of these lead to a solution.

In several other languages, other than VBA, this is a non-brainer. What am I missing?

"Coding for fun and profit ... mostly fun"

Re: How to Use an Array Variant as a control name?

Luc Pattyn31-Jul-09 2:22

Luc Pattyn

31-Jul-09 2:22

Assuming you want a solution for VB.NET, I would hold the references to the ListBoxes in a generic List (or even a Dictionary; not really an array), and most certainly not the names.

You then can use indexing, and even for each

In VBA, which I haven'tused for years, I would hope and use an array of ListBoxes.

BTW: you're in the wrong forum, this isn't a database question.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
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Re: How to Use an Array Variant as a control name?

dpminusa31-Jul-09 9:53

dpminusa

31-Jul-09 9:53

Thanks for the hint. Not sure which Forum is correct.

I tried to use the References Idea. It does not seem to apply or I am not clear on its use in this case. I see it is a way to get at Tools-> References. Tools-> References includes a reference to my open project. But I can get to these objects directly any way.

Can you offer a snippet?

I am also trying:

TabCtl0.Pages(TabCtl0.Value).Controls but it only has count and item as properties and no methods.

Hmmm...

"Coding for fun and profit ... mostly fun"

Re: How to Use an Array Variant as a control name?

Luc Pattyn31-Jul-09 10:20

Luc Pattyn

31-Jul-09 10:20

Hi,

I still don't know which language you want: VB, VB.NET, VBA.
Anyway they all belong in the "Visual Basic"forum.

I don't have any VBx snippets handy right now (and almost none most of the time, I'm more of a C# kind of guy).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

Re: How to Use an Array Variant as a control name?

dpminusa31-Jul-09 10:28

dpminusa

31-Jul-09 10:28

VBA is what Access 2007 uses as default, as far as I know. I am forced to use a lot of different tools and languages in my projects. I am more comfortable with other languages as well.

I will try to more it to the VBx forum. I guess that is a cut and paste unless you are a moderator.

Thanks for the Hints.

PS: If you need help with Perl, maybe I can reciprocate.

"Coding for fun and profit ... mostly fun"

Full Text Search

ps_prakash0230-Jul-09 21:33

ps_prakash02

30-Jul-09 21:33

Hi Guys,

I'm in need of your help.

my problem is, i have two tables namely MASTER and LINECONTENT.

"MASTER" table contains 5,00,000 records,
The columns in MASTER table is
masterid int, masterdesc varchar(1000).

"LINECONTENT" table contains more than 1000 records &
its columns are pageno int, lineno int, content varchar(2000).

I want to compare each row of "MASTER" table, masterdesc column value with the "LINECONTENT" table content column,
If any records matched i want to take the matched master record and store it in another table.

for this i used the below query.

select b.* from linecontent a
join master b on a.content like '%'+b.masterdesc+'%'

but this query is taking much.
so we are going full text search option.
i enabled fulltext search MASTER table as well as LINECONTENT table.

but i dont know how to link these tables in freetext search.
IS THERE ANY OPTIONS LIKE THE BELOW ONE.

SELECT b.* FROM LineContent A
JOIN Master b ON FREETEXT(a.Content,b.MasterDesc)

for this scenario which method i have to follow to make the process faster.

please help me

thanks & regards
P.Prakash

Data Retrieval

mgr_2k730-Jul-09 20:25

mgr_2k7

30-Jul-09 20:25

I have a problem of trying to find the query for finding invalid dates in my table which does not follow the following formats. Given are the valid formats:

1. 10/1/2007
2. Thu Sep 20 06:32:10 GMT-0400 (EDT) 2007
3. 10/1/2007 5:00

Can anybody please help me regarding this?
Thanks in advance.

Smile | :)

Re: Data Retrieval

Blue_Boy30-Jul-09 21:37

Blue_Boy

30-Jul-09 21:37

try this

select convert(varchar(10),cast(datevalue as datetime) ,120) from dateformats<br />
where convert(varchar(10),cast(datevalue as datetime) ,120) ='2007-10-01'

Date Thu Sep 20 06:32:10 GMT-0400 (EDT) 2007 will not work for this query because it will cause convertion error exception.

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